Some of the colonies in New England were offshoots of Massachusetts and had a common origin from the Puritans. Most of the Southern states are distinct in their founding, whether as a military border garrison (Georgia), a planter's colony due to overcrowding of Barbados (South Carolina), a scheme to implement a form of indentured servitude on a wider scale (North Carolina), gold mining/processing (Virginia), a religious grant for services rendered (Maryland), or as a holdover from another nation's colonization attempts that was separated from another colony later (Delaware).
Even today there is a distinct difference between parts of the South, i.e. the Upper South (KY, TN, WV, most of VA, and if not considered its own entity NC), the Deep South (eastern TX, AR, LA, MS, AL, GA, SC, northern FL), and whatever FL becomes once you cross I-4.